portfast and bpdufilter

BPDUfilter filters BPDUs in both directions, which will actually disable STP on the port.  Bpdu filter prevents inbound and outbound bpdu and will remove the portfast state on a port, if a bpdu is received.  Enabling BPDU filtering on an interface is the same as disabling spanning tree on it and can result in spanning-tree loops.

spanning-tree portfast enables you to bypass the listening, learning states of STP on a trunk or access port, and is intended more for connecting single host devices, if you configure this on a port connecting to another switch you still run the risk of a network loop.

" Bpdu filter prevents inbound and outbound bpdu and will remove the portfast state on a port, if a bpdu is received. "

If it is enabled, bpud shouldn't be received as it has been filtered out.  Why a bpud can still be received in the statement ?

Where should we apply bpdufilter ? Tks

Tks