You can try something like below
Search Parameters - "ACS Commons Report Builder Select Parameter Dynamically by Query"
Label - User Id
Name - userid
Query Language - JCR SQL2
Dropdown Query - SELECT * FROM [rep:User] AS user WHERE ISDESCENDANTNODE([/home/users])
Allowed Property Names: rep:authorizableId

Configuration:
Query - SELECT * FROM [rep:User] AS user WHERE ISDESCENDANTNODE([/home/users]) {{#if userid}} AND [rep:authorizableId] like '{{userid}}' {{/if}}
Query Language - JCR SQL2
Page Size - e.g. 50

Configure the required Result Columns
Regards
Albin I
www.albinsblog.com