Bollard build image result issue

cargo.toml

[package]
authors = ["Rynco Maekawa <lynzrand@outlook.com>"]
edition = "2018"
name = "docker-api"
version = "0.1.0"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
bollard = "0.8.0"
futures = "*"
hyper = {version = "0.13.7", features = ["stream"]}
tar = "*"
tokio = {version = "0.2.22", features = [
  "time",
  "io-util",
  "process",
  "stream",
  "rt-threaded",
  "macros",
]}

Dockerfile

# Shared Volume
FROM busybox:buildroot-2014.02
VOLUME /data
CMD ["/bin/sh"]

main.rs

use bollard::{image::BuildImageOptions, Docker};
use futures::stream::StreamExt;

#[tokio::main]
async fn main() {
    let docker = Docker::connect_with_local_defaults().unwrap();

    let mut tarball = Vec::new();
    let mut builder = tar::Builder::new(&mut tarball);
    builder
        .append_file(
            "Dockerfile",
            &mut std::fs::File::open("Dockerfile").unwrap(),
        )
        .unwrap();
    builder.finish().unwrap();
    drop(builder);
    docker
        .build_image(
            BuildImageOptions {
                dockerfile: "Dockerfile",
                t: "test:test",
                ..Default::default()
            },
            None,
            Some(tarball.into()),
        )
        .for_each(|x| async move { println!("{:?}", x) })
        .await;
}

python.out

{"stream":"Step 1/3 : FROM busybox:buildroot-2014.02"}
{"stream":"\n"}

{"stream":" ---\u003e 9875fb006e07\n"}
{"stream":"Step 2/3 : VOLUME /data"}
{"stream":"\n"}
{"stream":" ---\u003e Using cache\n"}
{"stream":" ---\u003e 9d806142a52c\n"}
{"stream":"Step 3/3 : CMD [\"/bin/sh\"]"}
{"stream":"\n"}

{"stream":" ---\u003e Using cache\n"}
{"stream":" ---\u003e f95df1e61acc\n"}
{"aux":{"ID":"sha256:f95df1e61accc87736b6625495179e07d3e19b31f35691c5e57d84cefcbe4623"}}

{"stream":"Successfully built f95df1e61acc\n"}

{"stream":"Successfully tagged test:test\n"}

rust.out

   Compiling docker-api v0.1.0 (D:\Projects\test\docker-api)
    Finished dev [unoptimized + debuginfo] target(s) in 10.26s
     Running `target\debug\docker-api.exe`
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })
Ok(CreateImageInfo { id: None, error: None, status: None, progress: None, progress_detail: None })

test.py

from io import BytesIO
from docker import APIClient

dockerfile = '''
# Shared Volume
FROM busybox:buildroot-2014.02
VOLUME /data
CMD ["/bin/sh"]
'''

f = BytesIO(dockerfile.encode("utf8"))
cli = APIClient()
resp = cli.build(fileobj=f, rm=True, tag="test:test")
print("\n".join([line.decode("utf8") for line in resp]))