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What is your PS version?

You have to put the code into themes/yourtheme/catalog/_partials/miniatures/product.tpl. Following code works and have the right stock quantity available decrease with cart.

{block name='product_quantities'}
      <div class="product-quantities">
        <label class="label">{l s='In stock' d='Shop.Theme.Catalog'}</label>
        <span data-stock="{$product.quantity}" data-allow-oosp="{$product.allow_oosp}">{$product.quantity} {$product.quantity_label}</span>
      </div>
  {/block}