Filter on nested lastModifiedDateTime attribute

[ExopenPM]

Hi,

We are fetching Inventory from the Visma.net ERP Service API with filters to only fetch changes from last time we fetch data using "lastModifiedDateTime" and "lastModifiedDateTimeCondition". This works fine but we have found that if the nested child object "warehouseDetails" changes (we are interested in 

"quantityOnHand" for instance) it has its own "lastModifiedDateTime" which updates while the root "lastModifiedDateTime" does not. Hence do we miss this update since we filter on the root object only.

Is it possible for us to get changes to "warehouseDetails" and other nested child objects as well via filter or do we have to always fetch all objects to be sure to get all updates?