Layer.php

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

class Layer
{
    protected $stockHelper;

    protected $scopeConfig;

    public function __construct(
        \Magento\CatalogInventory\Helper\Stock $stockHelper,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
    ) {
        $this->stockHelper = $stockHelper;
        $this->scopeConfig = $scopeConfig;
    }

    public function beforePrepareProductCollection(
        \Magento\Catalog\Model\Layer $subject,
        \Magento\Catalog\Model\ResourceModel\Collection\AbstractCollection $collection
    ) {
        if ($this->_isEnabledShowOutOfStock()) {
            return;
        }
        $this->stockHelper->addIsInStockFilterToCollection($collection);
    }

    protected function _isEnabledShowOutOfStock()
    {
        return $this->scopeConfig->isSetFlag(
            'cataloginventory/options/show_out_of_stock',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }
}