Comment # 10 on bug 1127766 from Arvin Schnell

(In reply to Ancor Gonzalez Sosa from comment #9)

> And how can YaST check that?

So far there is no snapper command to do that. Adding one might look
trivial at first but likely is not. Apart from checking mount points
one would also have to check mount flags (e.g. read-only, which btrfs
also sets during certain errors). Additional ACLs and SELinux might
make the checks more complicated.

I suggest to inform the user about the failure to create the snapshot
and let the user decide whether to continue or abort.