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
}

从 issue 中所示的 Commands.Checkout、CheckoutOptions 和 CheckoutModifiers 类型开始，然后跟踪子模块更新在哪里被触发。验证 checkout 行为，并确定如何通过一个选项抑制该更新；完成的标准是 checkout 可以跳过子模块更新，同时默认保留现有行为，并为新选项添加覆盖测试。