code: public void getChildren(String path, boolean watch, Children2Callback cb,
              Object ctx) {
          getChildren(path, watch ? watchManager.defaultWatcher : null, cb, ctx);
      }
docs: The Asynchronous version of getChildren. The request doesn't actually
  until the asynchronous callback is called.
  
  @since 3.3.0
  
  @see #getChildren(String, boolean, Stat)