protected function getAccessRootline(Item $item)
    {
        $accessRestriction = '0';
        $itemRecord = $item->getRecord();

        // TODO support access restrictions set on storage page

        if (isset($GLOBALS['TCA'][$item->getType()]['ctrl']['enablecolumns']['fe_group'])) {
            $accessRestriction = $itemRecord[$GLOBALS['TCA'][$item->getType()]['ctrl']['enablecolumns']['fe_group']];

            if (empty($accessRestriction)) {
                // public
                $accessRestriction = '0';
            }
        }

        return 'r:' . $accessRestriction;
    }