How to block fragmented UDP packets

Thanks google i read that using u32 module i can stop fragmented udp
packets. I have router with nat and conntrack and I cannot manage
bandwidth of these packets so I decided to cut them.
I found the rule:
iptables -m u32 --u32 "3&0x20=0x20"
or
|iptables -m u32 --u32 "3&0x20>>5=1"
or
||"4&0x3FFF=1:0x3FFF"
but none works.
I have to add that these packets cannot be clasified using HTB rules
and filters.

.

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