Stock.php

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<?php
namespace Magento\CatalogInventory\Model\Source;

use Magento\Eav\Model\Entity\Attribute\Source\AbstractSource;

class Stock extends AbstractSource
{
    public function getAllOptions()
    {
        return [
            ['value' => \Magento\CatalogInventory\Model\Stock::STOCK_IN_STOCK, 'label' => __('In Stock')],
            ['value' => \Magento\CatalogInventory\Model\Stock::STOCK_OUT_OF_STOCK, 'label' => __('Out of Stock')]
        ];
    }

    public function addValueSortToCollection($collection, $dir = \Magento\Framework\Data\Collection::SORT_ORDER_DESC)
    {
        $collection->getSelect()->joinLeft(
            ['stock_item_table' => 'cataloginventory_stock_item'],
            "e.entity_id=stock_item_table.product_id",
            []
        );
        $collection->getSelect()->order("stock_item_table.qty $dir");
        return $this;
    }
}