1. A method for use in managing reclaiming storage space in file systems, the method comprising: evaluating characteristics of a file system and a set of data services executing upon the file system, wherein the characteristics of the file system includes a file system layout type for the file system indicating a manner in which the file system is organized on a storage system, wherein the file system layout type impacts reclamation of storage space from the file system, wherein the file system layout type includes a thin file system layout and a thick file system layout; evaluating feedback received from a user of the file system indicating a policy from a set of policies for affecting reclamation of storage space from the file system; and based on the evaluation of the characteristics of the file system and the set of data services executing upon the file system, affecting reclamation of storage space from the file system based on the policy, wherein affecting reclamation of storage space from the file system includes adaptively changing a rate at which storage space is reclaimed from the file system, wherein the policy indicates evaluation of an impact of the set of data services executing on the file system and evaluation of an impact of reclamation of storage space from the file system on a set of storage resources of the storage system.