I'm using Docker for Mac Version 1.12.0-beta21 (build: 11019) on OS X 10.11.6. The container folder in
$HOME/Library/Containers/com.docker.docker contains 3.1 GB of space.
docker images -a however only shows one image which is 330 MB.
How can I clean up the container folder, so that it only contains the images I'm able to use?
There is an open issue regarding this problem: https://github.com/docker/for-mac/issues/371