CreateDirectory of a path name that exists on a Samba server (as a simple file) fails with the wrong code.

Steps to reproduce:
1. From a Windows machine, map a network drive to a Solaris Samba share.
2. Create a file "foo" on the share.
3. In a cmd window, do a 'md foo' when cwd is the directory containing the 'foo' file created earlier.

Expected result:
A subdirectory or file foo already exists.

Actual result:
The directory name is invalid.

I wrote a c++ program that just does the CreateDirectory and reports the error code from GetLastError.  The correct code is 183 (ERROR_ALREADY_EXISTS).  The code I got on 3.0.21b is 267.

I tested against a 3.0.10 Solaris Samba installation, and that correctly returned 183 as well.  I also tested against a Windows file server, just to be sure that 183 is the correct response, and that worked correctly as well.