NetFlow Filtered by src-addres

Hello sorry for my English =)

I must use netflow v5
If i want to collect traffic ONLY from network 10.0.0.0/8
How can i do it?

RouterBOARD 1100

[default@MikroTik] > system package print
Flags: X - disabled

NAME VERSION

0 system 5.0rc11

[default@MikroTik] > system license print
software-id: "E1SP-Z74E"
upgradable-to: v7.x
nlevel: 6
features:

current-firmware: "2.30"

for example in ipcad.conf (Freebsd)
i do next:
interface vlan* promisc filter "net 10.1.0.0/16 or net 172.16.0.0/16";