I am interested in the BTRFS support in particular, it is clear that performance in FS is key. However, what I like the most about Docker is the ability to use

I am interested in the BTRFS support in particular, it is clear that performance in FS is key. However, what I like the most about Docker is the ability to use layers and diff them. In effect, I want version control for images, because it allows me to not run extra provisioning tools for the images (just rely on simply Zookeeper stuff for app config). Whatever gives me 'vcs' for images in the most performant way, wins in my book.