Return list of all volumes in this Store's selected directory.

def listVolumes(self):
        """ Return list of all volumes in this Store's selected directory. """
        for (vol, paths) in self.paths.items():
            for path in paths:
                if path.startswith('/'):
                    continue
                if path == '.':
                    continue
                if self.userVolume is not None and os.path.basename(path) != self.userVolume:
                    continue
                yield vol
                break