There are two ways of solving this.
1) Do port mirroring of complete interface with all traffic and select whatever you need using filter in wireshark.
set ethernet-switching options analyzer employee–monitor input ingress interface ge-0/0/0.0
set ethernet-switching options analyzer employee–monitor input ingress interface ge-0/0/1.0
set ethernet-switching options analyzer employee–monitor output interface ge-0/0/10.0
2) To do the same using FF Filter apply your filter only on ingress
https://www.juniper.net/documentation/en_US/junos/topics/example/port-mirroring-local-ex-series.html
Thanks
Partha