def is_locator(self, path, relative=False):
        """
        Returns True if path refer to a locator.

        Depending the storage, locator may be a bucket or container name,
        a hostname, ...

        args:
            path (str): path or URL.
            relative (bool): Path is relative to current root.

        Returns:
            bool: True if locator.
        """
        if not relative:
            path = self.relpath(path)
        # Bucket is the main directory
        return path and '/' not in path.rstrip('/')