*/
function llms_get_post_parent_course( $post ) {

	$post = llms_get_post( $post );

	if ( ! $post || ! is_a( $post, 'LLMS_Post_Model' ) ) {
		return null;
	}

	/**
	 * Filter the course children post types
	 *
	 * @since Unknown
	 *
	 * @param $post_type string[] Names of the post types that can be children of a course.
	 */
	$post_types = apply_filters( 'llms_course_children_post_types', array( 'section', 'lesson', 'llms_quiz' ) );
	if ( ! in_array( $post->get( 'type' ), $post_types, true ) ) {
		return null;
	}

	/** @var LLMS_Section|LLMS_Lesson|LLMS_Quiz $post */
	return $post->get_course();