howto: IgnorePath?

I don't get my IgnorePath variables running. ;)

e.g. "share/work/.out/box.aux"

I want all ".out" Folders and their child-folders/-files be ignored
while syncing.

But this variants doesn't work:
"ignore = Path {.out}"
"ignore = Path {*/.out}"
"ignore = Path {*/.out/*}"

The aux-file below always appear in the sync.