Shared folders: symlinks visible as regular files

I'm using Parallels 5 on Mac and Ubuntu 8.04 as Guest OS.

I have one Shared Folder (~/Sites) mounted to Ubuntu. In this folder I have file and symlink:

mac# ls -la ~/Sites/file ~/Sites/symlink
-rw-r--r-- 1 vitaly staff 0 25 ноя 00:51 file
lrwxr-xr-x 1 vitaly staff 4 25 ноя 00:51 symlink -> file

But in Ubuntu symlink visible as regular file, not symlink:

ubuntu# ls -la file symlink
-rw-r--r-- 1 root root 0 2009-11-25 00:51 file
-rw-r--r-- 1 root root 0 2009-11-25 00:51 symlink

Is this bug or I'm something doing wrong?