How to set up FTP Server with Active Directory

I've set up a FTP server (vsftpd) with some local user account and it works fine. Now i want to upgrade this FTP server with an ability that can authorize user through Active Directory. I do a search around our forum and it leads me to this page:
Native LDAP, native Kerberos and Windows Server 2003 R2 AD Services and schema

This page is really good but I wonder how can i set up the same FTP home directory for everyone when they log in server or if there is another way to make it works. Any idea is much appreciated. Thank.