The updatedb indexer of the mlocate package seems to be confused by btrfs
subvolumes.  It refuses to descend into them and to index them.

When installing openSUSE, the partitioner defaults / to btrfs, and creates a
number of subvolumes for /opt, /usr/local, and so on.  As far as I can tell,
none of these directories get indexed by updatedb.  Running updatedb with the
--debug-pruning option shows that they are treated as bind paths which
(according to the default settings in /etc/updatedb.conf) are pruned:

# updatedb --debug-pruning
...
Skipping `/opt': bind mount
Skipping `/usr/local': bind mount
...

This is almost certainly not what the user wants (and is not what happens with
any other filesystem, AFAIK).

A temporary workaround is to disable pruning bind mounts in /etc/updatedb.conf,
though the problem really needs to be fixed in mlocate itself I think.

See also this Debian report for the same issue:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746943