Comment # 21 on bug 1167079 from Franck Bui

(In reply to Jiri Slaby from comment #18)
> And it does:
> > -                # Only unmount it when the type is nfs
> > -                if [ "$FS_TYPE" == "nfs" ]; then
> > +                # Only unmount it when the type is nfs or nfs4
> > +                if [ "$FS_TYPE" == "nfs" -o "$FS_TYPE" == "nfs4" ]; then

Well checking for "nfs4" too triggered the issue on your system but I think
it's  the whole logic which is actually borked.

Rather than looking at fstab to get the list of all possible nfs mounts, at
least it would seem better to get the list of nfs shares actually mounted
before suspending the system.