Craft\Neo_CriteriaModel::__descendantDist PHP Method

    protected function __descendantDist($elements, $value)
    {
        if (!$value || !$this->_descendant) {
            return $elements;
        }
        return array_filter($elements, function ($element) use($value) {
            return $element->level <= $this->_descendant->level + $value;
        });
    }