code: public static WatchMonitor createModify(Path path, int maxDepth, Watcher watcher) {
  		final WatchMonitor watchMonitor = create(path, maxDepth, WatchMonitor.ENTRY_MODIFY);
  		watchMonitor.setWatcher(watcher);
  		return watchMonitor;
  	}
docs: 创建并初始化监听，监听修改事件
  
  @param path 路径
  @param maxDepth 当监听目录时，监听目录的最大深度，当设置值为1（或小于1）时，表示不递归监听子目录
  @param watcher {@link Watcher}
  @return {@link WatchMonitor}
  @since 4.5.2