To copy share permissions from one shared folder to another you have to use the permcopy command which is included in Windows Resource Kit Tools:

permcopy \\SourceServer Sharename \\Destinationserver Sharename

This command will copy the share permissions but not the security permissions of a folder. In order to copy the security permissions (and the files and folders included within it) I personally use the robocopy command which is also included in Windows Resource Kit Tools:

robocopy \\Source \\Destination /MIR /SEC /r:3 /w:5