code: function(node) {
              var parent = node.getParent();
              while(parent) {
                  if(parent._id === this._id) {
                      return true;
                  }
                  parent = parent.getParent();
              }
  
              return false;
          }
docs: determine if node is an ancestor
  of descendant
  @method
  @memberof Kinetic.Container.prototype
  @param {Kinetic.Node} node