TL;DR
$ du -hs ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/
63G
$ docker ps -q -f 'status=exited' | xargs docker rm
$ docker images -q -f 'dangling=true' | xargs docker rmi
$ du -hs ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/
16G
Couldn’t bring up docker container since db connection failed. Taking a closer look at the db container showed the following:
...
db_1 | FATAL: could not write lock file "/var/run/postgresql/.s.PGSQL.5432.lock": No space left on device
...
Google search turned up the following blog post in slot 2: “No space left on device” on OSX Docker which somewhat explains the 64G cap on total storage for Docker on OS X.