A little late, but here's my fool proof solution useful for pages like the sign up/registration page where the user has to input a new password.
<form method="post">
<input type="text" name="fname" id="firstname" x-autocompletetype="given-name" autocomplete="on">
<input type="text" name="lname" id="lastname" x-autocompletetype="family-name" autocomplete="on">
<input type="text" name="email" id="email" x-autocompletetype="email" autocomplete="on">
<input type="password" name="password" id="password_fake" class="hidden" autocomplete="off" style="display: none;">
<input type="password" name="password" id="password" autocomplete="off">
</form>
Chrome will detect two password inputs and will not auto fill the password fields. However, the field id="password_fake" one will be hidden via CSS. So the user will only see one password field.
I've also added some extra attributes "x-autocompletetype" which is a chrome experimental specific auto fill feature. From my example, chrome will autofill in the first name, last name and email address, and NOT the password field.