how to see all parents pages visible on breadcrumnb

I need some help to see all parents on breadcrumb;
Now I have this on functions.php

<em>//====================================Breadcrumbs=============================================================================================
function wp_fanzone_breadcrumb() {
    global $post;
    echo '<ul id="breadcrumbs">';
    if (!is_home()) {
        echo '
<li><a href="';
        echo home_url();
        echo '">';
        echo 'Home';
        echo '</li>
<li class="separator"> / ';
        if (is_category() || is_single()) {
            echo '
<li>';
            the_category(' </li>
<li class="separator"> /
<li> ');
            if (is_single()) {
                echo '</li>
<li class="separator"> /
<li>';
                the_title();
                echo '</li>
';
            }
        } elseif (is_page()) {
            if($post->post_parent){
                $parents = get_post_ancestors( $post->ID );
                $id = ($parents) ? $parents[count($parents)-1]: $post->ID;
                $title = get_the_title();
                foreach ( $parents as $ancestor ) {
                    $output = '
<li><a href="'.get_permalink($ancestor).'" title="'.get_the_title($ancestor).'">'.get_the_title($ancestor).'</a></li>
 <li class="separator">/';
                }
                echo $output;
                echo '<strong title="'.$title.'"> '.$title.'';
            } else {
                echo '
<li><strong> '.get_the_title().'</strong></li>
';
            }
        }
    }
    echo '';
}</em>

[Moderator note: Please wrap your code in backticks]
But in this way I can see only Home, another level and the page where I am…

Anyone can help to solve?

Thanks a lot in advance.