[OpenAFS] how to tell if a dir resides in AFS volume?

[shuaijie wang]

Hi all,

Is there any method to check if a dir resides in AFS volume? Since AFS can
be mounted in any local logical path, simply checking prefix "/afs" seems
not sufficient for all the cases. So is there any system call like
"is_inafs()" to accomplish this?

Thanks.