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// from here http://wordpress.stackexchange.com/questions/149164

function show_parent_post_meta( $page = NULL, $meta_key ) {
	if ( is_numeric( $page ) ) {
		$page = get_post( $page );
	} elseif( is_null( $page ) ) {
		$page = isset( $GLOBALS['post'] ) ? $GLOBALS['post'] : NULL;
	}
	if ( ! $page instanceof WP_Post ) return false;
	// if we are here we have a valid post object to check,
	// get the ancestors
	$ancestors = get_ancestors( $page->ID, $page->post_type );
	if ( empty( $ancestors ) ) return false;
	// ancestors found, let's check if there are featured images for them
	global $wpdb;
	$metas = $wpdb->get_results(
		"SELECT post_id, meta_value
		FROM {$wpdb->postmeta}
		WHERE meta_key = '{$meta_key}'
		AND post_id IN (" . implode( ',', $ancestors ) . ");"
	);
	if ( empty( $metas ) ) return false;
	// extract only post ids from meta values
	$post_ids = array_map( 'intval', wp_list_pluck( $metas, 'post_id' ) ); 
	// compare each ancestor and if return meta value for nearest ancestor 
	foreach ( $ancestors as $ancestor ) {
		if ( ( $i = array_search( $ancestor, $post_ids, TRUE ) ) !== FALSE ) {
			return $metas[$i]->meta_value;
		}
	}
	return false;
}