Description

With Graphdrivers, the docker daemon automatically selects the most suitable (opinionated / configurable) storage driver to use by

• checking what the previously used storage-driver was
• trying each storage-driver, and if supported (based on backing filesystem, distro, etc) picks the first one
• falling back to vfs as last resort

With the containerd integration we should have a similar selection to make things "work" out of the box. Currently, we use containerd.DefaultSnapshotter as a default, but this const is hard-coded;

• Linux: "overlayfs"
• Windows "windows"
• Unix (freeBSD, openBSD, macOS) "native"

We should:

• Get a list of snapshotters supported by containerd (containerd checks if they can be loaded)
• Pick the first one from the list, in an (opinionated) order.
• Consider if we want (e.g.) aufs and/or devicemapper to be part of automatic selection, or only "manual"