Can I filter on models deep in a 'contains' ?

I'm trying to use a combination of the 'contains' behaviour,
pagination and filters to generate data to show in a table. The
application is an auction app that has auctions, which have bids on
them and each bid is also associated with a user.

Auction
Item
Attribute
LatestBid
User

In my controller I have pagination defined thus...

var $paginate = array(
'Auction' => array(
'limit' => 50,
'fields' =>
array('id','start_time','end_time','active','start_price','item_id','created'),
'contain' => array(
'Item' => array(
'fields' => array('id','sku','title','created'),
'ItemAttribute' => array('fields' =>
array('name','value','item_id'))
),
'LatestBid' => array(
'fields' =>
array('id','auction_id','bid_amount','created','user_id'),
'User' => array('fields' => 'username')
)
),
'order' => array('Auction.end_time' => 'desc')
));

This works a treat and I get back the data exactly as I want it. The
next step is I'm trying to add a search feature to the table so that a
user can type in any value in the table and have it search those
fields. One of the fields I want to search on is the username that
belongs to the User model which is associated with the LatestBid but
I'm not sure if I can do this. I've seen examples showing filtering 1
level down, i.e. I'd be able to filter on LatestBid.bid_amount, but
not seen 2 levels down and I'm not sure this is even possible because
the user information is retrieved in a separate SQL request by the
looks of things.

Any ideas?

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