samba - Jan 2007 - 3.0.23d - call_nt_transact_ioctl(0x90078): Currently not implemented

All, 

Since upgrading to 3.0.23d on several linux servers, I'm seeing the
following error repeatedly in my logs:

Jan  2 15:05:49 boothost smbd[27935]: [2007/01/02 15:05:49, 0]
smbd/nttrans.c:call_nt_transact_ioctl(2332)
Jan  2 15:05:49 boothost smbd[27935]:   call_nt_transact_ioctl(0x90078):
Currently not implemented.

Aside from the obvious, what does this error mean? I've googled for this
specific error, but didn't have much luck. Should I just ignore these
errors? So far as I can tell, service to XP clients is not affected.

[global]from one of the server's smb.conf follows. Testparm report no
problems.

[global]
workgroup = GSS
netbios name = BOOTHOST-1230
server string = 1230 Boothost Server
password server = test-pdc.1240.good-sam.com
map to guest = Bad User
encrypt passwords = Yes
security = domain
log file = /var/log/samba/%m.log
log level = 1
max log size = 0
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
domain logons = No
os level = 75
preferred master = True
domain master = False
dns proxy = No
wins support = No
wins server = 172.21.24.5
name resolve order = wins host
veto oplock files = /*.xls/

Thanks,
Ryan
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