Open Common Dialog Extended

hello everyone,
I have a question, maibe somebody could answer me.
Under Win2K, NTFS i want to make an Open CommonDialog control wich has the following properties: it has to browse only directories wich belong to the logged user.
For example, if the is a structure like the following:
MyDirs:
Dir1 - owner is user1
Dir2 - owner is user1
Dir3 - owner is user1
Dir4 - owner is user2
Dir5 - owner is user3, and ....
when i hit the Open file it should browse only the Dir1, Dir2, Dir3 if user1 is logged, and so on....

I want that the other's user directories (who has owner other user than the logged one and who are not accessible for the logged user) are showed in the Open Common Dialog ... and my problem is that i don't want these directories to be displayed in the control. I want to be showed only the user logged directories.
I don't know how to do this ... I can check who's the a directory owner and compare with the logged user but the problem is how to link the common dialog to this filter...