!!! Overview
[{$pagename}] ([SSFPR]) is a "Flag" passed to the [LDAP_SERVER_SEARCH_OPTIONS_OID] which is used with an LDAP Search request to control various behaviors.For [Microsoft Active Directory] this instructs the server to search all [NamingContext] replicas __except__ the [Application Directory Partitions] [NamingContext] replicas that are subordinate to the search base, even if the search base is not instantiated on the server.  

For [AD LDS], the behavior is the same __except that it also includes__ [Application Directory Partitions] [NamingContext] replicas in the search.  !! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [SERVER_SEARCH_FLAG_PHANTOM_ROOT|https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-adts/782fa852-2aef-42cd-b3d7-3f7a85861289|target='_blank'] - based on information obtained 2021-12-17