code: function(excludeSelf) {
  			var path = [],
  				sep = this.tree.options.keyPathSeparator;
  			this.visitParents(function(n) {
  				if (n.parent) {
  					path.unshift(n.key);
  				}
  			}, !excludeSelf);
  			return sep + path.join(sep);
  		}
docs: Return the parent keys separated by options.keyPathSeparator, e.g. "id_1/id_17/id_32".
  @param {boolean} [excludeSelf=false]
  @returns {string}