Get the location

$ docker info | grep -i "Docker Root Dir"

Docker Root Dir: /mnt/sda1/var/lib/docker

List the content

• Log into the host

docker-machine ssh 

• And select it

sudo ls /mnt/sda1/var/lib/docker

aufs        builder     containers  image       network     plugins     swarm       tmp         trust       volumes

where:

• Docker - Image
• Docker - Network
• Docker - Volume Mount