I have successfully created Layer navigation REST API using given solution on this question Magento 2 api - How to get layer navigation filters available in rest api? However I want if someone clicked on a particular brand then other brand should be remove from layer navigation Currently it's return result based on category id, I would like to add more filter like Brand, color etc

 public function __construct(\Magento\Framework\Webapi\Rest\Request 

                $this->_request         = $request;

     * Retrieve filterlist
     * @api
     * @return array
    public function retrieve(){     

        $category = $this->_request->getParam('categoryId');

        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();

        $filterableAttributes = $objectManager->getInstance()->get(\Magento\Catalog\Model\Layer\Category\FilterableAttributeList::class);

        $appState = $objectManager->getInstance()->get(\Magento\Framework\App\State::class);
        $layerResolver = $objectManager->getInstance()->get(\Magento\Catalog\Model\Layer\Resolver::class);
        $filterList = $objectManager->getInstance()->create(
                    'filterableAttributes' => $filterableAttributes

            $layer = $layerResolver->get();
            $filters = $filterList->getFilters($layer);
            $maxPrice = $layer->getProductCollection()->getMaxPrice();
            $minPrice = $layer->getProductCollection()->getMinPrice();  

        $i = 0;
       foreach($filters as $filter)
           //$availablefilter = $filter->getRequestVar(); //Gives the request param name such as 'cat' for Category, 'price' for Price
           $availablefilter = (string)$filter->getName(); //Gives Display Name of the filter such as Category,Price etc.
           $items = $filter->getItems(); //Gives all available filter options in that particular filter
           $filterValues = array();
           $j = 0;
           foreach($items as $item)

               $filterValues[$j]['display'] = strip_tags($item->getLabel());
               $filterValues[$j]['value']   = $item->getValue();
               $filterValues[$j]['count']   = $item->getCount(); //Gives no. of products in each filter options
           if(!empty($filterValues) && count($filterValues)>1)
               $filterArray['availablefilter'][$availablefilter] =  $filterValues;

        echo json_encode($filterArray);



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