Filter Direction with Scapy

I'm using Scapy and the sniff function on eth1. Can I filter the direction, so that only incoming packages are captured?

My Code:

import sys
from scapy.all import *

def packet_callback(packet):
    print(packet.show())

def main():
    sniff(iface="eth1", prn=packet_callback)

if __name__ == '__main__':
    main()