Require sub navigation to display on all levels

I have a working pages template that has a sub-navigation which dynamically link to its relevant child page. i.e. add a new sub-page in Perch and the navigation creates a link to that child page. What I need to happen though is that the child page needs to display the sub-navigation on it's level. Is this possible and how?

here is the page template :

<?php include($_SERVER['DOCUMENT_ROOT'].'/perch/runtime.php'); ?>

<?php perch_layout('global.header'); ?>

<?php perch_pages_navigation('navigation'); ?>

<?php perch_content('Page Style'); ?>

    <div class="main-content">
      <div class="container">
        <div class="sub-page-row w-row">

<?php perch_pages_navigation(array(
'levels'=>0,
'template' => array('subnav.html'),
'from-path' => '*',


)); ?>

          <div class="column-bare w-col w-col-9">

           <?php perch_content('Blocks'); ?>

          </div>
        </div>
      </div>
    </div><img class="tg-on-pages triangle-graphic" sizes="25vw" src="/images/triangle-graphic.png" srcset="/images/triangle-graphic-p-500.png 500w, /images/triangle-graphic-p-800.png 800w, /images/triangle-graphic-p-1080.png 1080w, /images/triangle-graphic.png 1128w">
  </div>


<?php perch_layout('global.footer'); ?>

the sub-nav template:

<perch:before>
 <div class="column-bare w-clearfix w-col w-col-3">
            <div class="subnav w-clearfix" id="subnav" role="navigation"></perch:before><a class="subnav-link" href="<perch:pages id="pagePath" />"><perch:pages id="pageNavText" /></a>
      <perch:after>
    </div>
  </div>
  </perch:after>

and my diagnostics:

Perch: 3.0.8, PHP: 7.1.1, MySQL: mysqlnd 5.0.12-dev - 20150407 - $Id: b396954eeb2d1d9ed7902b8bae237b287f21ad9e $, with PDO
Server OS: Darwin, apache2handler
Installed apps: content (3.0.8), assets (3.0.8), categories (3.0.8), perch_blog (5.5.1)
App runtimes: <?php $apps_list = array( 'content', 'categories', 'perch_blog', );
PERCH_LOGINPATH: /perch
PERCH_PATH: /Applications/MAMP/htdocs/perch
PERCH_CORE: /Applications/MAMP/htdocs/perch/core
PERCH_RESFILEPATH: /Applications/MAMP/htdocs/perch/resources
Image manipulation: GD
PHP limits: Max upload 32M, Max POST 32M, Memory: 128M, Total max file upload: 32M
F1: 0c66c2e1f82f9e0b7617b2cb8270f2c7
Resource folder writeable: Yes
HTTP_HOST: localhost:8888
DOCUMENT_ROOT: /Applications/MAMP/htdocs
REQUEST_URI: /perch/core/settings/diagnostics/
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php