How to get the entity that field belongs to in the case of an entity reference field
You can get that with an entity query:

// Get IDs of all film nodes that reference this entity
$nids = Drupal::entityQuery('node')
  -&gt;condition('type', 'film')
  -&gt;condition('field_foo.target_id', $entity-&gt;id())
  -&gt;execute();

// Load the nodes
$nodes = Drupal::entityManager()
  -&gt;getStorage('node')
  -&gt;loadMultiple($nids);