beware, this will be overwritten if you run! docker-machine regenerate-certs <vm-name>
choose a hostpath that suits your needs
VBoxManage sharedfolder add "default" --name "data" --hostpath "/your/host/path/" --automount
VBoxManage setextradata "default" VBoxInternal2/SharedFoldersEnableSymlinksCreate/data 1
docker-machine ssh default