Filtering on collection where is used method addWebsiteNamesToResult()

Magento1 _websiteFilter callback on collection

protected function _websiteFilter($collection, $column)
{
    if (!$value = $column->getFilter()->getValue()) {
        return $this;
    }

    $stores = Mage::app()->getWebsite($value)->getStores();
    foreach ($stores as $store) {
        $collection->addStoreFilter($store);
    }

    return $this;
}