public function getAllParentSkus(string $sku) {
    $static = &drupal_static(__FUNCTION__, []);

    if (isset($static[$sku])) {
      return $static[$sku];
    }

    $query = $this->connection->select('acm_sku_field_data', 'acm_sku');
    $query->addField('acm_sku', 'sku');
    $query->addField('acm_sku', 'id');
    $query->join('acm_sku__field_configured_skus', 'child_sku', 'acm_sku.id = child_sku.entity_id');
    $query->condition('child_sku.field_configured_skus_value', $sku);
    $static[$sku] = $query->execute()->fetchAllKeyed(0, 1) ?? [];

    return $static[$sku];
  }