It was a misunderstanding between me and the guy that reported the problem to me.
Say, you exclude / and include /some/directory.
Any file or directory in /some/directory will be backed up including all subdirectories.
However, if you create a filesystem /some/directory/another_dir/mountpoint only the empty directory /some/directory/another_dir/mountpoint will be backed up. But no files or directories below.
However, simply adding /some/directory/another_dir/mountpoint to the include list fixes this.
Then you have
/some/directory/
/some/directory/another_dir/mountpoint
in your include list which might look strange at first sight.
You might also enable cross mount points (which we prefer not to enable), I could not test this.
But for me one entry in the include list for every filesystem is fine.
