Drupal 8, getting paragraph parent

function hook_suggestions_paragraph_alter(array &$suggestions, array $variables, $hook) {

  $parent = $variables['elements']['#paragraph']->getParentEntity()->bundle();

  if($parent){

    $paragraph = $variables['elements']['#paragraph'];

    $sanitized_view_mode = strtr($variables['elements']['#view_mode'], '.', '_');

//$suggestions[] = 'paragraph__' . $sanitized_view_mode;
//$suggestions[] = 'paragraph__' . $paragraph->bundle();
//$suggestions[] = 'paragraph__' . $paragraph->bundle() . '__' . $sanitized_view_mode;
$suggestions[] = 'paragraph__' . $paragraph->bundle() . '__' . $sanitized_view_mode . '__parent_' . $parent; 
}
}