code: function ($node) {
        // just show only one superior level
        var $upperLevel = $node.closest('.nodes').siblings().removeClass('hidden');
        // just show only one line
        $upperLevel.eq(2).children().slice(1, -1).addClass('hidden');
        // show parent node with animation
        var $parent = $upperLevel.eq(0).find('.node');
        this.repaint($parent[0]);
        $parent.addClass('sliding').removeClass('slide-down').one('transitionend', { 'node': $node }, this.showParentEnd.bind(this));
      }
docs: show the parent node of the specified node