+1 Yes! This is a MUST without at LEAST that docker is unusable and keeps 'breaking' an otherwise running Mac.
What would be even better if the files/images inside the container would be visible from the Mac, so one can do 'emergency' maintenance and remove a file or two when it refuses to start up again and has run the mac to a grinding halt.
I can't believe this beta has run for so long and not addressed that very basic stability necessity?
Those files should really be mounted into the docker machine from the mac os x host filesystem, just like a shared directory.