How to achieve showChildLevel feature, similar to showParentLevel={false}

[jhaankit]

Algolia provides a feature showParentLevel={boolen}.
How to achieve similar to this feature where a user can only see the children of selected facet values?

An example use case:
Step1: We have facet values at level-0 as below

-A0
-B0
-C0

Step2: On selection of B0, only the tree of B0 should display (assume B0 has S1, T1, U1 facet values in it)

-B0
   -S1
   -T1
   -U1

Step3: On selection of S1, the same level should display as there is no child to S1.

-S1
-T1
-U1

[Haroenv]

If a user would like to "remove" that applied filter, how could they do it when the filter which is set is no longer displaying?

[jhaankit]

With the help of back button, as shown in the pic