CI3 - Are old sessions in file auto deleted from server

Hi,

im using latest dev version of CI3 and have sessions saved in the filesystem. 

Here is an example of my config

Code:

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'domain';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = '/home/user/sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;

$config['cookie_prefix']    = 'domain';

$config['cookie_domain']    = '.domain.com';
$config['cookie_path']        = '/';
$config['cookie_secure']    = FALSE;
$config['cookie_httponly']     = FALSE;

My question is .. if the session id is being auto updated every 300 seconds and thus creating a new file in the sessions folder do the older ones get auto removed or is this something I need to put in place my self ?

Thanks to everyone for all your hard work on bringing CI3 to fruition. Good to see things progressing with CI again :-)