When overridden by a derived class, represents a synchronization provider that synchronizes data to and from a replica that tracks filters.
The IFilterTrackingProvider interface is implemented by a provider that represents a replica that tracks filters. A replica tracks a filter when it stores metadata that indicates whether an item is in the filter, and whether an item has been in the filter but has moved out. The replica might also contain filter forgotten knowledge for the filter, if it has removed metadata that tracks whether an item has been in the filter but has moved out, or if the replica does not track the filter the first time it synchronizes with a filtered replica and begins tracking the filter at a later time.
To support a replica that tracks filters, the provider must return an IFilterTrackingProvider interface when Sync Framework specifies IID_IFilterTrackingProvider to the QueryInterface method of the ISyncProvider interface of the provider.