5   SOCK state=listen path=test_mkfds-unix-seqpacket-ns type=seqpacket     listen seqpacket              1 test_mkfds-unix-seqpacket-ns
ASSOC,STTYPE,NAME,SOCK.STATE,SOCK.TYPE,SOCK.LISTENING,UNIX.PATH: 0
the netns for the seqpacket socket is extracted as expectedly
    5   SOCK state=listen path=@test_mkfds-unix-seqpacket-ns type=seqpacket     listen seqpacket              1 @test_mkfds-unix-seqpacket-ns
ASSOC,STTYPE,NAME,SOCK.STATE,SOCK.TYPE,SOCK.LISTENING,UNIX.PATH: 0
the netns for the abstract seqpacket socket is extracted as expectedly