How to hide “Filter user list” from “All Users” screen

You can use the views_users filter to alter it. Here’s an example:

/**
 * Remove the users view
 */
add_filter( 'views_users', '__return_empty_array' );

if you want to remove it for every user.

Here’s another example how you could remove it for non-admins (PHP 5.4+):

/**
 * Remove the users view for non-admins
 */
add_filter( 'views_users', function( $views ) 
{
    return current_user_can( 'manage_options' ) ? $views : [];
} );