:param str|None path: Path to file or folder
    :param str|None base: Base folder to use for relative paths (default: current working dir)
    :return str: Absolute path of parent folder of 'path'

def parent_folder(path, base=None):
    """
    :param str|None path: Path to file or folder
    :param str|None base: Base folder to use for relative paths (default: current working dir)
    :return str: Absolute path of parent folder of 'path'
    """
    return path and os.path.dirname(resolved_path(path, base=base))