Comment 7 for bug 1940916

Here we have to make a solution that satisfies bug 1827159 and this one (bug 1940916):

1) Non exclude the squash, trace and tmp filesystems if the -p option is provided. Exclude them otherwise.
2) if the -N option is present (the include option), no exclude the selected fs for inclusion (as exclude has precedence over include).

But, it seems in the upstream sid Debian package this behaviour doesn't occur, so I'll check the build of that 2.3.1-1 version on the supported Ubuntu series for that 3 filesystems.