Idea is to have a command that could be run to view a tree of history on a particular image.

Display could be similar to the Linux tree command to show any time a tag is branched and which image it was branched off of.

Example usage:

docker tree <image_id>

56456456515 - Tag: ubuntu:12.04
├── 56456456456
│     └── 65454565454 - Tag: new_image_name:latest
└── 65456454454 - Tag: ubuntu:latest 

You get the idea.