Eager loading child collection with NHibernate

I want to load root entities and eager load all it's child collection and aggregate members.

Have been trying to use the SetFetchMode in FluentNHibernate, but I am getting duplicates in one of the child collection since I have a depth of 3 levels. DistinctRootEntityResultTransformer unfortunately only removes the root duplications.

return Session.CreateInvoiceBaseCriteria(query, archived)
    .AddOrder(new Order(query.Order, query.OrderType == OrderType.ASC))
    .SetFetchMode("States", FetchMode.Eager)
    .SetFetchMode("Attestations", FetchMode.Eager)
    .SetFetchMode("AttestationRequests", FetchMode.Eager)
    .SetFetchMode("AttestationRequests.Reminders", FetchMode.Eager)
    .SetResultTransformer(new DistinctRootEntityResultTransformer())
    .List<Invoice>();

Could I use multi queries or something similar to archive this?

Furthermore, wouldn't this approach result in unnecessarily huge result sets from the database?

Any suggestions?