1. A method for managing data in a file system over a network using one or more processors that execute instructions to perform actions, comprising: instantiating a file system engine to perform actions including: providing a file system that includes one or more file system objects, wherein the one or more file system objects are accessible by two or more clients that use different native permission schemes; and receiving from a client, an access request that is associated with the one or more file system objects, wherein the access request includes one or more native permission values that are supported by the client; and instantiating a permissions engine to perform actions including: providing one or more platform permission values from a platform permission scheme, wherein the one or more platform permission values are associated with the one or more file system objects, and wherein the platform permission scheme reduces computing resources employed to access the one or more file system objects by replacing use of the two or more different native permission schemes; providing one or more requested platform permission values based on the platform permission scheme and the native permission values included in the access request; comparing the one or more requested platform permission values to the platform permission values associated with the one or more file system objects; and providing access rights to the one or more file system objects based on an affirmative result of the comparison.