<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_common_paths_ancestor(*args):
 """ Gets common paths ancestor of given paths. Usage:: u'/Users/JohnDoe/Documents' :param \*args: Paths to retrieve common ancestor from. :type \*args: [unicode] :return: Common path ancestor. :rtype: unicode """


    path_ancestor = os.sep.join(get_common_ancestor(*[path.split(os.sep) for path in args]))
    LOGGER.debug("> Common Paths Ancestor: '{0}'".format(path_ancestor))
    return path_ancestor