ps, systat vs top shows different process owner?

[Bartosz Stec]

Hi list,
I have a SAMBA server (version 3.5.11) installed over 8.2-STABLE. I have 
just noticed, that top shows USERNAME of all smbd processes as root, 
while systat and ps show user logged to SAMBA.

ps output of example user:

    # ps -a -U foo.bar
       PID  TT  STAT      TIME COMMAND
    19731  ??  S      0:10,19 /usr/local/sbin/smbd -D -s
    /usr/local/etc/smb.conf


top output for the same PID:

    # top -d1 | grep 19731
    19731 root               1  44    0 17220K  7844K select   0:12 
    0.29% smbd

systat output is consistent with ps.

Is that expected behaviour? Could someone explain it to me?

-- 
Bartosz Stec