Problem is, I cannot determine some path, is 'mounted on' what.

I already tried df -k. It gives me a complete list.

I want to know something, if I am in /abc/def/ghi

then on which filesystem it is mounted, how much free space, % utilized & so on... only for the filesystem consisting /abc/def/ghi.

uname -a gives following output -
AIX machinename 2 5 0038967C4C00