docker-py volume binding failure

example.py

import docker
client = docker.Client(base_url='unix://var/run/docker.sock', version='1.11', timeout=10)
client.pull('busybox', tag='latest')
container = client.create_container('busybox:latest', volumes=['/var/run/docker.sock'])

# This fails. It's based on https://github.com/dotcloud/docker-py#using-volumes
client.start(container, binds={'/var/run/docker.sock': {'bind': '/var/run/docker.sock', 'ro': False}})

failure.log

---------------------------------------------------------------------------
APIError                                  Traceback (most recent call last)
<ipython-input-39-53b5ae26cbdd> in <module>()
----> 1 client.start(container, binds={'/var/run/docker.sock': {'bind': '/var/run/docker.sock', 'ro': False}})

/usr/local/lib/python2.7/dist-packages/docker/client.pyc in start(self, container, binds, port_bindings, lxc_conf, publish_all_ports, links, privileged)
    740         url = self._url("/containers/{0}/start".format(container))
    741         res = self._post_json(url, data=start_config)
--> 742         self._raise_for_status(res)
    743 
    744     def stop(self, container, timeout=10):

/usr/local/lib/python2.7/dist-packages/docker/client.pyc in _raise_for_status(self, response, explanation)
    113             response.raise_for_status()
    114         except requests.exceptions.HTTPError as e:
--> 115             raise APIError(e, response, explanation=explanation)
    116 
    117     def _result(self, response, json=False, binary=False):

APIError: 500 Server Error: Internal Server Error ("Cannot start container 29c79a8de096a2f9b0b8edbaf13e0c49e201bc11ce4dd03b86929633c6ed3094: Invalid bind specification: /var/run/docker.sock:{'bind': '/var/run/docker.sock', 'ro': False}")

Have you tried doing this with the docker CLI? That is, is it a docker.py problem or a general docker problem?
Have you tried giving the container "privileged" status? Not sure how to do this with docker.py. On the commandline it is --privileged.