Resetting docker completely

I’ve been playing with docker in a virtualized TrueScale - Looks like I’ve ran out of space when it was pulling images.

Now I’m getting errors like:

failed to register layer: rename /mnt/.ix-apps/docker/image/overlay2/layerdb/tmp/write-set-1740450614 /mnt/.ix-apps/docker/image/overlay2/layerdb/sha256/9a074fae28b88ea2537473583829b90d7d8f3bf6fbf7597852d174bec9abd3e9: file exists

Whats the proper way to reset docker to factory state?

doing docker system prune -a, did not fix it - unsetting a pool seems to move the .ix-app somewhere into boot storage?

rm -rf /mnt/.ix-apps/docker ended up generating boot loop for the system.