Parent theme template path

Templates.php

<?php
namespace PublicFunctionOrg\WordPress;
class Templates {
    private $theme_dir = "/my-plugin-templates/";

    public function get_template_path($template){
        $path = $this->theme_dir.$template;
        if( is_file( get_template_directory().$path)){
            return get_template_directory().$path;
        }
        return false;
    }
}

$templates = new Templates();
$filepath = $templates->get_template_path("my-template.php");