<?php
add_filter('map_meta_cap', function($caps, $cap, $user_id, $args) {
    if($cap === 'edit_user') {
        $subject = get_userdata($user_id);
        $target = get_userdata($args[0]);
        if(in_array('subject_role_to_allow', $subject->roles)
            && in_array('target_role', $target->roles)) {
            /**
             * We use edit_others_posts because the subject_role_to_allow
             * edit users of a dependent role, is a superset of Editor role
             * maybe any other already granted capability to this user/role
             * could work
             */
            return array_merge(['edit_others_posts'],
                array_filter($caps, function($role) {
                    return $role !== 'edit_users';
                }));
        }
    }
    return $caps;
}, 13, 4);