How to use the doc8.utils.find_files function in doc8

def scan(cfg):
    if not cfg.get("quiet"):
        print("Scanning...")
    files = collections.deque()
    ignored_paths = cfg.get("ignore_path", [])
    files_ignored = 0
    file_iter = utils.find_files(
        cfg.get("paths", []), cfg.get("extension", []), ignored_paths
    )
    default_extension = cfg.get("default_extension")
    file_encoding = cfg.get("file_encoding")
    for filename, ignoreable in file_iter:
        if ignoreable:
            files_ignored += 1
            if cfg.get("verbose"):
                print("  Ignoring '%s'" % (filename))
        else:
            f = file_parser.parse(
                filename, default_extension=default_extension, encoding=file_encoding
            )
            files.append(f)
            if cfg.get("verbose"):
                print("  Selecting '%s'" % (filename))