Custom filters in filelist

I was wondering if it was possible to mimic the effect from compare where it hides folders/files that exist on both sites.

Think of it as an extension to mask select, but instead of selecting the folders that matches <PATTERN> it hides folders that match (or does not match?) <PATTERN> from the file/folder view.

Its purely an aestetic function to make it easier to go through large directories, so i've classified it as a minor feature request, but a request nonetheless