get_ancestors will return array form value. So if you talking about how to get and display that ancestors with link:
<?php
$arrAncestors = get_ancestors( $post->ID, 'page');
$cntAncestors = COUNT($arrAncestors);
if($cntAncestors > 0) {
$parentPostId = $arrAncestors[$cntAncestors - 1];
$parentPageLink = get_permalink($parentPostId);
$parentTitle = get_the_title($parentPostId);
print '<li><a href="https://wordpress.stackexchange.com/questions/243836/<?php $parentPageLink ?>" title="<?php $parentTitle; ?>"><?php $parentTitle; ?></a></li>';
}
?>
Hope you get solution from above snippet.