目前，如果我运行git status，我会得到一堆这样的东西：
On branch master
Your branch is up-to-date with 'origin/master'.
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git checkout -- <file>..." to discard changes in working directory)
(commit or discard the untracked or modified content in submodules)
modified: projects/submodule1 (untracked content)
modified: projects/submod2 (untracked content)
modified: projects/submodule3 (new commits, modified content, untracked content)
modified: projects/submodule4 (modified content, untracked content)
...
我做关心new commits和modified content，但是很多这些子模块会生成自己的垃圾（比如构建文件等），而且我不会＃ 39;关心其中任何一个（如果它很重要，我应该将它添加到子模块并跟踪它）。有没有办法让git忽略子模块中的untracked content，而不是new commits或modified content？