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