Increase btrfs gpt partition after enlarging the virtual drive

gistfile1.txt

oxygen-system-vm ~ # fdisk -l /dev/sda
GPT PMBR size mismatch (41943039 != 62914559) will be corrected by w(rite).
Disk /dev/sda: 30 GiB, 32212254720 bytes, 62914560 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 10B93AE8-1045-434C-A36E-F7801B17CE32

Device       Start      End  Sectors  Size Type
/dev/sda1     2048     6143     4096    2M BIOS boot
/dev/sda2     6144   268287   262144  128M EFI System
/dev/sda3   268288  1316863  1048576  512M Linux swap
/dev/sda4  1316864 41940991 40624128 19.4G Linux filesystem
oxygen-system-vm ~ # parted /dev/sda
GNU Parted 3.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Warning: Not all of the space available to /dev/sda appears to be used, you can fix the GPT to use all of the space (an extra 20971520 blocks) or continue
with the current setting?
Fix/Ignore? fix
Model: VMware Virtual disk (scsi)
Disk /dev/sda: 32.2GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system     Name    Flags
 1      1049kB  3146kB  2097kB                  grub    bios_grub
 2      3146kB  137MB   134MB   fat16           boot    boot, esp
 3      137MB   674MB   537MB   linux-swap(v1)  swap
 4      674MB   21.5GB  20.8GB  btrfs           rootfs

(parted) resizepart
Partition number? 4
Warning: Partition /dev/sda4 is being used. Are you sure you want to continue?
Yes/No? y
End?  [21.5GB]? 32GB
(parted) print
Model: VMware Virtual disk (scsi)
Disk /dev/sda: 32.2GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system     Name    Flags
 1      1049kB  3146kB  2097kB                  grub    bios_grub
 2      3146kB  137MB   134MB   fat16           boot    boot, esp
 3      137MB   674MB   537MB   linux-swap(v1)  swap
 4      674MB   32.0GB  31.3GB  btrfs           rootfs

(parted) quit
Information: You may need to update /etc/fstab.

oxygen-system-vm ~ # btrfs filesystem resize max /
Resize '/' of 'max'
oxygen-system-vm ~ # df -h
Filesystem      Size  Used Avail Use% Mounted on
udev             10M  4.0K   10M   1% /dev
/dev/sda4        30G   17G   12G  59% /
tmpfs           201M  988K  200M   1% /run
shm            1002M     0 1002M   0% /dev/shm
cgroup_root      10M     0   10M   0% /sys/fs/cgroup