You don't say what type of fileserving you wish to do; NFS or CIFS. But I don't think it matters.
Both are considered insecure; even if authentication and authorization are well controlled, these technologies transfer unencrypted data blocks. If you don't have complete end-to-end control of all access to the network, this is insecure.
The best practice is to implement a VPN for filesharing over insecure networks.
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