Function any_chain_ancestor_iter 

pub(crate) fn any_chain_ancestor_iter<Item>(
    non_finalized_state: &NonFinalizedState,
    db: &ZebraDb,
    hash: Hash,
) -> Iter<Item> 
where
    Item: ChainItem,

Returns a generic chain item iterator over the relevant chain containing hash, in order from the largest height to genesis.

The item with hash is included in the iterator. hash can come from any chain or db.