Hmm, thanks, but as I said I use openSUSE. They stated in
AUFS: this driver relies on the AUFS union file system. Neither the upstream kernel nor the SUSE one supports this file system. Hence the AUFS driver is not built into the SUSE Docker package.
The same in a special README_SUSE.md of the SUSE docker package.
So I’m a bit lost. 