Mercurial's only true "plugin" extension: inotify... and can it be done in Git?

When reading "Distributed Revision Control with Mercurial"[1] to see how Mercurial differs from Git, in the chapter 14 "Adding functionality with extensions" there is description (in section 14.1) of one interesting extension (see also [2]), namely 'inotify' extension.

This extension[3][4] optimises "hg status" command by asking file notification daemon about changed files instead of doing stat. I'm not sure how useful this extension is: inotify is Linux specific, and Linux has fast stat... nevertheless this is one example where extension (plug-in) framework shows that it can do more than good scriptability.

I wonder if, and how, such 'extension' could be done with Git...

References: =========== [1] http://hgbook.red-bean.com [2] http://www.selenic.com/mercurial/wiki/index.cgi/UsingExtensions [3] http://hgbook.red-bean.com/hgbookch14.html#x18-31700014.1 [4] http://www.selenic.com/mercurial/wiki/index.cgi/InotifyExtension