How to know no one else blocked an outbound/inbound packet that i allowed in WFP?

Lets say i am monitoring the layer FWPM_LAYER_OUTBOUND_TRANSPORT_V4, and i monitor some packets and allow some of them.

My question is, how can i tell that no one else blocked this packet after me, and this packet really made it to the miniport and were sent? Or in case of Inbound, how can i tell if it really made it to the app that was being sent to, and no one blocked it after my WFP driver (Another WFP or NDIS driver blocking it) ?