mount --move doesn't work

[Pasha R]

Hi,
I'm trying to understand how mount --move can be used. Whenever I use it, I
get an error "mount: wrong fs type, bad option, bad superblock..."
for example (something I found that supposed to work):
mkdir foo bar
mount --bind foo foo
mount --move foo bar

mount: wrong fs type, bad option, bad superblock on foo,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail or so

What is wrong with it?

P.S. I'm using F17, with kernel 3.8.3
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