ancestry property
Root-to-direct-parent chain. Length equals the sub-item's
nesting depth. Owners are always null on delete events —
the sub-item is gone by the time the notification arrives, so
there's no envelope to recover parents from. Apps that need
to correlate a delete with the deleted item's ancestry should
cache the last seen CSubItemUpdated for that (id, subName)
and look it up here.
Implementation
final List<CAncestor> ancestry;