WP_Media_List_Table::column_thumbnail( WP_Post $post )

	public function column_thumbnail( $post ) {
		$user_can_edit = current_user_can( 'edit_post', $post->ID );

		// Get all post types except attachments and revisions.
		$parent_types = get_post_types();
		unset( $parent_types['attachment'] );
		unset( $parent_types['revision'] );

		// Set output variable.
		$output = '';

		foreach ( $parent_types as $parent_type ) {

			// Get all posts where this attachment is the featured image.
			$relationship_ids = cp_get_object_relationship_ids( $post->ID, 'thumbnail', $parent_type );

			if ( ! empty( $relationship_ids ) ) {
				foreach ( $relationship_ids as $relationship_id ) {
					if ( absint( $relationship_id ) !== 0 ) {
						$ancestor          = get_post( $relationship_id );
						$ancestor_type_obj = get_post_type_object( $ancestor->post_type );
						$title             = _draft_or_post_title( $relationship_id );

						if ( $ancestor_type_obj->show_ui && current_user_can( 'edit_post', $relationship_id ) ) {
							$output .= '<strong><a href="' . esc_url( get_edit_post_link( $relationship_id ) ) . '">' . esc_html( $title ) . '</a></strong><br>';
						} else {
							$output .= $title . '<br>';
						}
					}
				}
			}
		}
		return $output;
	}