Instead of dismissing Iran, have negotiations and clear the air and be transparent as peaceful Afghanistan is in both countries interest. Iran is not India, so lets not bracket them with India, not only they are our neighbours but also Afghanistan too.
Afghanistan is not Syria, Yemen or Iraq; its Pak backyard. Pak defeated Iran's proxies in Afg in 90s and is able to do again.
And while her 90s allies are defeated, only community Iran can find support in Afghanistan is Hazara.