What does useless use of allowoverride mean?

Question

Apache HTTP Server

In Apache configs, such a warning is useless use of allowoverride in httpd conf.
What does this mean?

Answer 1

Such a warning can be issued when AllowOverride is duplicated in the config for nested directories, for example:

<Directory "/var/www">
    AllowOverride None
</Directory>
<Directory "/var/www/config">
    AllowOverride None
</Directory>