Example of tree groups in reefine taken from shop theme

reefine_tree_groups_example.html

{tree_groups}
	<div class="reefine_tree">
		<h3 class="group_{group_name}">{label}</h3>
		<ul>
		{filters}
			<li class="{filter_active_class} filter-id-{filter_id} {has_active_subfilters_class}">
			<a href="{url}" aria-selected="{filter_active_boolean}" rel="nofollow">{filter_title} ({filter_quantity})</a>
				{subfilters_1}
				<ul>
				{filters_1}
				<li class="{filter_active_class_1} filter-id-{filter_id_1} {has_active_subfilters_class_1}">
				<a href="{url_1}" aria-selected="{filter_active_boolean_1}" rel="nofollow">{filter_title_1} ({filter_quantity_1})</a>
					{subfilters_2}
					<ul>
					{filters_2}
					<li class="{filter_active_class_2} filter-id-{filter_id_2} {has_active_subfilters_class_2}">
					<a href="{url_2}" aria-selected="{filter_active_boolean_2}" rel="nofollow">{filter_title_2} ({filter_quantity_2})</a>
						{subfilters_3}
						<ul>
						{filters_3}
						<li class="{filter_active_class_3} filter-id-{filter_id_3} {has_active_subfilters_class_3}">
						<a href="{url_3}" aria-selected="{filter_active_boolean_3}" rel="nofollow">{filter_title_3} ({filter_quantity_3})</a>
						</li>
						{/filters_3}
						</ul>
						{/subfilters_3}
					</li>
					{/filters_2}
					</ul>
					{/subfilters_2}
				</li>
				{/filters_1}
				</ul>
				{/subfilters_1}
			</li>
		{/filters}
		</ul>
	</div>
{/tree_groups}