When in Gantt view the assignee or Label filter does not work.

It is useful to review tasks for an assignee in the Gantt view so that the relationship and sequencing of these can be seen. This is true for labels as well.

The requirement would:

When an assignee filter is applied all tasks belonging wholly or partially to that assignee are displayed along with any parent, grandparent or great grandparent tasks.

Returning just the task will not give enough context. Returning Parent, Grandparent etc will provide the context needed to better under stand the task.