laravel-smarty registerFilter in ServiceProvider

(laravel-smarty)SampleServiceProvider.php

<?php
namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class ApplicationServiceProvider extends ServiceProvider
{

    public function boot()
    {
        $this->registerFilters();
    }

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {

    }

    public function registerFilters()
    {
        $smarty = $this->app['view']->getSmarty();
        $smarty->registerFilter('post', [$this, 'add_header_comment']);
    }

    /**
     * @param $tpl_source
     * @param $smarty
     * @return string
     */
    public function add_header_comment($tpl_source, $smarty)
    {
        return "<?php echo \"<!-- Created by Smarty From ServiceProvider! -->\n\"; ?>\n".$tpl_source;
    }
} 

It's get that error "Method Illuminate\View\Factory::getSmarty does not exist."

Same error,
Call to undefined method Illuminate\View\Factory::getSmarty()