option to not update submodules when doing checkout

it seems to be a known issue that, at least when there are numerous binary files in a submodule, the submodule update process takes much longer than specifically checking out each submodule. I am, using libgit2sharp to do these checkouts, but the checkout on the superproject takes much longer (~5 sec for super vs <0.1sec for each submodule).
It looks like Commands.Checkout is, effectively, running:

git checkout [sha]
git submodule update --recursive -f

or something like it, but I just want the first line, not both. Is there some repositoryOption or CheckoutOption or something I can use to use it like this?

my usage of ligit2sharp is:

using (Repository repo =  new Repository(filePath))
{
   //logging and timing
   Commands.Checkout(
      repo,
      commit,
      new CheckoutOptions() { CheckoutModifiers = CheckoutModifiers.Force }
      );
   //logging and timing
}

Start at Commands.Checkout and the CheckoutOptions and CheckoutModifiers types shown in the issue, then trace where submodule updates are triggered. Verify the checkout behavior and identify how an option could suppress that update; done means a checkout can skip submodule updates while preserving the existing behavior by default, with coverage for the new option.