Mostrar apenas subcategoria principal em posts relacionados

-Crops
---fruit
----papaya (Main)

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$terms = get_the_terms( get_the_ID(), 'post_tag');

$args = array (
'category__not_in' => $tags,
'post__not_in' => array(get_the_ID()),
'posts_per_page' => '10',
'ignore_sticky_posts' => 1,
'meta_key' => '_thumbnail_id',
);


$query = new WP_Query($args);

if ($query->have_posts()) { ?>
<section class="entry-related">
<h3>Articulos relacionados</h3>
<div class="flex flex-fluid">
<?php
while ($query->have_posts()) {
$query->the_post();
get_template_part('template-parts/loops/loop', 'related');
}
?>
</div>
</section>

<?php
}
wp_reset_postdata();

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