ulimit -n 1024

          Ensure that you pick a number that is larger than the
          number of files you expect to be monitored.

          ``kqueue(2)`` does not provide enough information about the
          following things:

          * The destination path of a file or directory that is renamed.
          * Creation of a file or directory within a directory; in this
            case, ``kqueue(2)`` only indicates a modified event on the
            parent directory.

          Therefore, this emitter takes a snapshot of the directory
          tree when ``kqueue(2)`` detects a change on the file system
          to be able to determine the above information.

:param event_queue:
    The event queue to fill with events.
:param watch:
    A watch object representing the directory to monitor.
:type watch:
    :class:`watchdog.observers.api.ObservedWatch`
:param timeout:
    Read events blocking timeout (in seconds).
:type timeout:
    ``float``
:param event_filter:
    Collection of event types to emit, or None for no filtering (default).
:type event_filter:
    Iterable[:class:`watchdog.events.FileSystemEvent`] | None
:param stat: stat function. See ``os.stat`` for details.
N)